fix: update elasticsearch version

[ruidazeng]

This should fix the test_py311 (windows latest, deps-latest errors.

=========================== short test summary info ===========================
ERROR tests/test_search.py - AttributeError: `np.float_` was removed in the NumPy 2.0 release. Use `np.float64` instead.
ERROR tests/test_search.py - AttributeError: `np.float_` was removed in the NumPy 2.0 release. Use `np.float64` instead.
===== 2822 passed, 54 skipped, 10 warnings, 2 errors in 373.36s (0:06:13) =====
Error: Process completed with exit code 1.

The elasticsearch version used is elasticsearch==7.9.1, which is 4 years old and uses the removed numpy.float_.

elasticsearch fixed this in elastic/elasticsearch-py#2551 and released in 8.15.0 (August 2024) and 7.17.12 (September 2024).

[ruidazeng]

May I request a review @lhoestq

[HuggingFaceDocBuilderDev]

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[lhoestq]

thanks !